CN108319063A - Electronic device, display assembly and backlight module thereof - Google Patents

Abstract

The application discloses backlight unit, it includes: a light guide plate; the light sources are arranged on the side edge of the light guide plate at intervals; the light uniformizing element is arranged on the light guide plate; the flexible circuit board part is bonded on the area of the light guide plate which is not covered by the dodging element through the connecting adhesive tape, and a reserved gap is reserved between the flexible circuit board part and the dodging element; the light shield layer sets up in backlight unit's non-display area, and joint tape includes a plurality of first and second sticky tape portions, and first sticky tape portion sets up the region that corresponds at the light source, and second sticky tape portion sets up the region that interval region corresponds between two adjacent light sources, and joint tape at least part surpasss the one end that flexible circuit board is close to the reservation clearance, and first sticky tape portion surpasss the flexible circuit board size and is greater than the flexible circuit board size that second sticky tape portion surpasss. The backlight module can avoid the problems of light leakage and uneven brightness of the backlight module under the condition of reducing the width occupied by the non-display area of the backlight module.

Description

Electronic device and its display component, backlight module

technical field

The invention relates to the technical field of backlights of electronic devices, in particular to an electronic device, a display component thereof, and a backlight module.

Background technique

At present, with the development of science and technology, electronic devices such as smart phones have gradually become necessities in people's lives.

The backlight module is an important part of an electronic device. At present, the backlight module of portable electronic devices such as smartphones usually adopts a side-entry backlight module, that is, the light emitted by the light source enters the light guide plate from the side of the light guide plate, so that the The display panel of the electronic device provides backlight. However, since the light source and some related structures of this side-type backlight module need to be arranged on the side of the light guide plate, it occupies a large non-display area, which is not conducive to narrow borders and To achieve a full screen, how to shorten the width of the backlight module in the non-display area without affecting the normal display of the backlight module and the display panel has become a focus of attention.

Contents of the invention

A technical solution adopted in the embodiment of the present application is to provide a backlight module, which includes: a light guide plate; a plurality of light sources, all arranged on the side of the light guide plate and arranged at intervals in the width direction of the light guide plate; The light element is arranged on the light guide plate; the flexible circuit board and the connecting tape, the flexible circuit board is bonded to the area of the light guide plate not covered by the light uniform element through the connection tape, and there is a reserved space between the flexible circuit board and the light uniform element. Gap; light-shielding layer, arranged in the non-display area of the backlight module, and used to block the light emitted by the light source and leaked through the reserved gap, the connecting tape includes a plurality of first tape parts and a plurality of second tape parts, the first The tape part is arranged in the area corresponding to the light source, the second tape part is arranged in the area corresponding to the interval area between two adjacent light sources, the connecting tape is at least partially beyond the end of the flexible circuit board close to the reserved gap, and the first tape part is beyond the flexible The size of the circuit board is larger than the size of the second adhesive tape portion protruding from the flexible circuit board.

Another technical solution adopted by the embodiments of the present application is to provide a display assembly, which includes a display panel and a backlight module for providing backlight for the display panel, the backlight module being the above-mentioned backlight module.

Yet another technical solution adopted by the embodiments of the present application is to provide an electronic device, which includes the above-mentioned display component.

The beneficial effect of the embodiment of the present application is: the embodiment of the present application includes a backlight module by setting: a light guide plate; a plurality of light sources, all arranged on the side of the light guide plate and arranged at intervals in the width direction of the light guide plate; On the light guide plate; flexible circuit board and connection tape, the flexible circuit board part is bonded to the area of the light guide plate not covered by the uniform light element through the connection tape, and there is a reserved gap between the flexible circuit board and the light uniform element; light-shielding layer , is arranged in the non-display area of the backlight module, and is used to block the light emitted by the light source and leaks through the reserved gap. The connecting tape includes a plurality of first adhesive tape parts and a plurality of second adhesive tape parts, and the first adhesive tape parts are arranged on In the area corresponding to the light source, the second tape part is arranged in the area corresponding to the interval area between two adjacent light sources, the connecting tape is at least partly beyond the end of the flexible circuit board close to the reserved gap, and the first tape part exceeds the size of the flexible circuit board It is larger than the size of the second adhesive tape that exceeds the flexible circuit board, and can avoid light leakage in the backlight module while reducing the width occupied by the non-display area of the backlight module. Further, because the adhesive tape at the corresponding position of the light source exceeds the flexible circuit board The size of the connecting tape exceeds the size of the flexible circuit board at the corresponding position of the interval area between the light sources, so that the problem of uneven brightness can be avoided.

Description of drawings

Fig. 1 is a schematic diagram of the positional relationship of the light guide plate, the light shielding layer, and the light source in the light guide plate according to the embodiment of the present application;

Fig. 2 is a schematic cross-sectional structure diagram of the backlight module of the embodiment of the present application along the direction A-A in Fig. 1;

Fig. 3 is a schematic cross-sectional structure diagram of the backlight module of the embodiment of the present application along the B-B direction in Fig. 1;

Fig. 4 is a schematic diagram of the shading principle of the shading layer of the backlight module at the position shown in Fig. 2;

Fig. 5 is a schematic diagram of the shading principle of the shading layer of the backlight module at the position shown in Fig. 3;

Fig. 6 is a schematic structural view of another embodiment of the backlight module of the present application;

Fig. 7 is a schematic structural diagram of a backlight module according to another embodiment of the present application;

FIG. 8 is a schematic diagram of an exploded structure of an electronic device according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific embodiments described here are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only some structures related to the present application are shown in the drawings but not all structures. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The terms "first", "second", etc. in this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Please refer to FIG. 1 to FIG. 3 together. FIG. 1 is a schematic diagram showing the positional relationship of the light guide plate, the connecting tape, the light shielding layer, and the light source in the top view of the light guide plate according to the embodiment of the present application. 2 is a schematic cross-sectional structure diagram of the backlight module of the embodiment of the present application along the direction A-A in FIG. 1; FIG. 3 is a schematic cross-sectional structural diagram of the backlight module of the embodiment of the present application along the direction B-B in FIG.

In this embodiment, the backlight module includes a back frame 11, a reflector 12, a light guide plate 13, a uniform light element 14, a light-shielding layer 15, a flexible circuit board 16, a connecting tape 17, a light-shielding tape 18, a first plastic frame 19, The second plastic frame 20 and a plurality of light sources 21 .

The back frame 11 is a box-shaped structure with one side open. The back frame 11 includes a bottom wall 111 and a side wall 112 . The bottom wall 111 and the side wall 112 are connected by bending. The material of the back frame 11 can be metal, for example, iron, aluminum and so on.

The reflection sheet 12 is disposed on the bottom wall 111 of the back frame 11 and located inside the accommodating cavity.

The light guide plate 13 is disposed on the reflection sheet 12 and located inside the accommodating cavity.

The light guide plate 13 includes a light incident end portion 131 and a light guide plate main body portion 132 . The thickness of the light incident end portion 131 near the light incident side of the light guide plate 13 is greater than the thickness of the light guide plate main body portion 132 .

Optionally, the thickness of the light-incident end portion 131 gradually decreases from the light-incident side to the direction away from the light-incident side, and the thickness of the main body portion 132 of the light guide plate is uniform, that is, the thickness is equal everywhere.

A plurality of light sources 21 are disposed on an area of the reflective sheet 12 not covered by the light guide plate 13 , and the plurality of light sources 21 are all located at a side of the light guide plate 13 . The light source 21 is located on the light incident side of the light guide plate 13 . The light source 21 can be an LED lamp. The light source 21 is disposed on a side of the light incident end portion 131 away from the main body portion 132 of the light guide plate. For example, as shown in FIG. 2 , the light source 21 is located on the left side of the light guide plate 13 .

As shown in FIG. 1 , the light guide plate 13 may be rectangular when viewed from its front, and a plurality of light sources 21 are arranged at intervals along the width direction of the light guide plate 13 .

The uniform light element 14 is disposed on the main body portion 132 of the light guide plate, and the light uniform element 14 includes a diffusion film 141 , a first light enhancement film 142 , and a second light enhancement film 143 which are sequentially arranged away from the light guide plate. Optionally, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are mutually independent film layers, or at least two of the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are set as One.

The first plastic frame 19 is disposed on the bottom wall 111 of the back frame 11 and abutted against the side wall 112 of the back frame 11 . The first plastic frame 19 is set on the side of the light source 21 away from the light guide plate 13 , for example, the first plastic frame 19 is set on the left side of the light source 21 , and there is a light mixing and heat dissipation space between the first plastic frame 19 and the light source 21 .

The part of the flexible circuit board 16 is disposed on the area of the light guide plate 13 not covered by the light uniform element 14 , and the part of the flexible circuit board 16 not disposed on the light guide plate 13 is disposed above the first plastic frame 19 and the light source 21 .

The light source 21 is fixed to the lower surface of the part of the flexible circuit board 16 not disposed on the light guide plate 13 , and the light source 21 is electrically connected to the flexible circuit board 16 . The lines on the flexible circuit board 16 are connected to the light source 21 and the external power supply pin, so that the external power supply pin can supply power to the light source 21 .

The flexible circuit board 16 is bonded to the area of the light guide plate 13 not covered by the light homogenizing element 14 through the connecting tape 17 . The connecting tape 17 can be a double-sided tape. One side of the double-sided tape is bonded to the lower surface of the flexible circuit board 17 at the corresponding position, and the other side is bonded to the upper surface of the light guide plate 13 at the corresponding position.

There is a reserved gap a between the end of the flexible circuit board 16 close to the dodging element 14 and the end of the dodging element 14 close to the flexible circuit board 16 . On the one hand, the reserved gap a is used to match the assembly error, and on the other hand, the backlight module can still be used normally under a certain degree of thermal deformation.

The light-shielding adhesive tape 18 is disposed on the flexible circuit board 16 and is disposed on a partial area of the light uniform element 14 . The light-shielding tape 18 can be bonded to the upper surface of the dodging element 14 to fix the dodging element 14 .

Optionally, the light-shielding tape 18 may include a first sub-light-shielding tape part 181 and a second sub-light-shielding tape part 182, the first sub-light-shielding tape part 181 is covered on the flexible circuit board 16, and the second sub-light-shielding tape part 182 is covered on the uniform surface. on a partial area of the light element 14 . The thickness of the first sub-light-shielding tape part 181 may be greater than the thickness of the second sub-light-shielding tape part 182 .

The second glue frame 20 fixes the light-shielding tape 18 and the flexible circuit board 16 on the side of the light-shielding tape 18 and the flexible circuit board 16 away from the light uniform element 14 (for example, the left side shown in FIG. 2 ).

The first plastic frame 19 is located in the accommodating cavity of the back frame 11 , and the second plastic frame 20 is located outside the accommodating cavity of the back frame 11 .

The light-shielding layer 15 is arranged in the non-display area of the backlight module, and is used to block the light emitted by the light source 21 and leaked through the reserved gap a, so that the light leaked directly by the light source 21 through the reserved gap a is blocked by the light-shielding layer 15 . Wherein, the non-display area refers to the area covered by the light-shielding tape 18 , and the display area refers to the area not covered by the light-shielding tape 18 .

Optionally, in this embodiment, the light shielding layer 15 may be disposed between the diffusion film 141 and the first enhancement film 142, specifically, may be disposed on the surface of the diffusion film 141 close to the first enhancement film 142, or, It is disposed on the surface of the first enhancement film 142 close to the diffusion film 141 . The coverage area of the light shielding layer 15 corresponds to the end area of the diffusion film 141 or the first light enhancement film 142 near the light source 21 .

It should be understood that the light-shielding layer 15 can be arranged at any position in the non-display area, as long as it can block the light that leaks directly from the light source 21 through the reserved gap a.

For example, the light shielding layer can also be arranged between the diffusion film 141 and the first brightness enhancement film 142, specifically, it can be arranged on the surface of the diffusion film 141 close to the first brightness enhancement film 142, or on the surface of the first brightness enhancement film 142 close to on the surface of the diffusion film 141. The coverage area of the light shielding layer corresponds to the end area of the diffusion film 141 or the end of the first light enhancement film 142 close to the light source 21 .

The light-shielding layer can also be arranged between the light-shielding element 14 and the light guide plate 13, and the coverage area of the light-shielding layer corresponds to the end area of one end of the light-shielding element 14 or the light-guide plate 13 near the light source 21, and the light-shielding layer can be arranged on the light-shielding layer. The element 14 is close to the surface of the light guide plate 13 , or is arranged on the surface of the light guide plate 13 close to the light homogenizing element 14 .

The light-shielding layer 15 is made of light-shielding material. For example, the light-shielding layer 15 may be a black ink layer. The light-shielding layer 15 may be formed through a screen printing process or a spraying process.

Optionally, in this embodiment, the thickness of the light shielding layer 15 is uniform.

Optionally, the thickness of the light-shielding layer 15 is smaller than that of the connecting tape 17 .

The connecting tape 17 includes a plurality of first adhesive tape parts 171 and a plurality of second adhesive tape parts 172, the first adhesive tape parts 171 are arranged in the area corresponding to the light sources 21, and the second adhesive tape parts 172 are arranged in the interval between two adjacent light sources 21 In the area corresponding to the area, the connection tape 17 at least partially exceeds the end of the flexible circuit board 16 near the reserved gap a, and the size of the first tape part 171 beyond the flexible circuit board 16 is greater than the size of the second tape part 171 beyond the flexible circuit board 16 .

In one embodiment, the end of the first tape part 171 close to the light uniform element 14 can exceed the end of the flexible circuit board 16 close to the light uniform element 14, and the end of the second tape part 172 close to the light uniform element 14 can be connected to the flexible circuit The end of the plate 16 close to the uniform light element 14 is flush, that is, the size of the second tape part 172 beyond the flexible circuit board 16 can be zero, and the size of the first tape part 171 beyond the flexible circuit board 16 is larger than the size of the second tape part 172 beyond the flexible circuit board size.

Because the connecting tape 17 (first tape part 171) in the corresponding area of the light source 12 exceeds the size of the flexible circuit board 16, the connecting tape 17 (second tape part 172) corresponding to the space between two adjacent light sources 12 exceeds the flexible circuit board 16. The size of the circuit board 16 makes the light-shielding effect produced by the connecting tape 17 in the reserved gap in the corresponding area of the light source 21 stronger than the light-shielding effect produced by the connecting tape 17 in the interval area between the two light sources 21, thereby avoiding the shading effect caused by the light source 12. The problem of uneven brightness is caused by the fact that the light intensity in the area is relatively high and the light intensity in the interval area between two adjacent light sources 12 is relatively small.

As shown in Figures 2 and 3, Figure 2 is a cross-sectional view of the area corresponding to the light source, so the connecting tape 17 in Figure 2 is specifically the first adhesive tape part 171, and Figure 3 is the space between two adjacent light sources 21. The cross-sectional view, therefore, the connecting tape 17 in FIG. 3 is specifically the second tape portion 172 .

Please refer to FIG. 4 . FIG. 4 is a schematic diagram of the light-shielding principle of the light-shielding layer of the backlight module at the position shown in FIG. 2 .

As shown in FIG. 4 , the light S1 is the light that leaks directly from the light source 21 through the reserved gap a. It can be blocked by the light-shielding layer 15 so as not to directly exit the backlight module and avoid directly entering human eyes. The light-shielding layer 15 and the uniform light element 14 overlap in the width direction, therefore, the light-shielding layer 15 will not occupy the width of the non-display area of the backlight module alone, so the backlight can be avoided while reducing the width of the non-display area. The module has light leakage.

Further, because the size of the first tape portion 171 in the region corresponding to the light source 21 exceeds the size of the flexible circuit board 16 is greater than the size of the second tape portion 172 in the corresponding region of the space between the light sources 21 beyond the size of the flexible circuit board 16, therefore, for The shading effect brought by the connecting tape 17 is greater at the light source 21 than at the space between the light sources 21 , which can avoid the uneven brightness of the backlight module.

Please refer to FIG. 5 . FIG. 5 is a schematic diagram of the light-shielding principle of the light-shielding layer of the backlight module at the position shown in FIG. 3 .

As shown in FIG. 5 , the light S2 is the light leaked from the light source 21 adjacent to the spaced area of the light source 21 through the reserved gap a, which can also be blocked by the light-shielding layer 15 so as not to directly radiate out of the backlight module and avoid direct ray into human eyes.

It is not difficult to understand that the shading principle in FIG. 3 is similar to that in FIG. 2, except that no light source is installed in the position of FIG. The size beyond the flexible circuit board 16 is small, where the shading effect brought by the connecting tape 17 is weak, which can avoid the uneven brightness of the backlight module.

Please refer to FIG. 6 . FIG. 6 is a schematic structural diagram of a backlight module according to another embodiment of the present application. The difference from the above-mentioned embodiments is that the thickness of the light-shielding layer 25 gradually decreases along the direction away from the light source 21. Since the closer to the light source 21, the intensity of the light becomes stronger. Therefore, through this arrangement, it is possible to avoid the light-shielding layer 13 in the longitudinal direction The problem of uneven brightness on the screen.

Please refer to FIG. 7 . FIG. 7 is a schematic structural diagram of a backlight module according to another embodiment of the present application. The difference from the above embodiment is that the thickness of the part of the connecting tape 27 in the reserved gap a gradually becomes smaller along the direction away from the light source 21. By this arrangement, the brightness in the length direction of the light guide plate 13 can also be avoided. uneven problem.

Please refer to FIG. 8 . FIG. 8 is a schematic diagram of an exploded structure of an electronic device according to an embodiment of the present application. In this embodiment, the electronic device 50 may be a smart phone, and in other embodiments, the electronic device may also be a tablet computer, a palmtop computer, a smart watch, and the like.

In this embodiment, the electronic device 20 may include a rear case 51 , a middle frame 52 , a display component 53 and a cover 54 .

The middle frame 52 is fixedly connected with the rear shell 51 .

The display component 53 is fixed on the middle frame 52 .

The display assembly 53 includes a backlight module 531 and a display panel 532 , and the backlight module 53 is used to provide backlight for the display panel 532 .

The display panel 532 may be a liquid crystal display panel or other display panels.

The cover plate 54 covers the display unit 53 . The cover plate 54 may be a transparent glass cover plate, and in the non-display area, the cover plate 54 may be opaque. For example, the cover plate 54 is coated with light-shielding ink in the non-display area.

It should be understood that other structures of the electronic device 50 , such as a circuit board, may be disposed between the rear case 51 and the middle frame 52 , and since this application does not involve improvements to these components, no specific description is given here.

In other embodiments, the electronic device 50 may also adopt other structures, and the above description of the structure of the electronic device 50 does not limit the protection scope of the present application.

In the embodiment of the present application, the backlight module includes: a light guide plate; a plurality of light sources, which are all arranged on the side of the light guide plate and arranged at intervals in the width direction of the light guide plate; uniform light elements, arranged on the light guide plate; flexible circuit boards and Connecting tape, the part of the flexible circuit board is bonded on the area of the light guide plate not covered by the uniform light element through the connecting tape, and there is a reserved gap between the flexible circuit board and the light uniform element; the light-shielding layer is arranged on the non-display of the backlight module In the area, and used to block the light emitted by the light source and leaked through the reserved gap, the connecting tape includes a plurality of first adhesive tape parts and a plurality of second adhesive tape parts, the first adhesive tape parts are arranged in the area corresponding to the light source, and the second adhesive tape parts Set in the area corresponding to the interval area between two adjacent light sources, the connecting tape is at least partially beyond the end of the flexible circuit board close to the reserved gap, and the size of the first tape part beyond the flexible circuit board is larger than that of the second tape part beyond the flexible circuit board The size of the backlight module can avoid light leakage in the backlight module while reducing the width occupied by the non-display area of the backlight module. Further, because the size of the connecting tape at the corresponding position of the light source exceeds the size of the flexible circuit board is greater than the distance between the light sources The connection tape at the corresponding position of the area exceeds the size of the flexible circuit board, which can avoid the problem of uneven brightness.

The above is only the implementation of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process conversion made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims (10)

1. a kind of backlight module, which is characterized in that the backlight module includes：

Light guide plate；

Multiple light sources are arranged at the light guide plate side and are spaced setting in the width direction of the light guide plate；

Even optical element is arranged on the light guide plate；

Flexible PCB and connection adhesive tape, the flexible circuit plate part is by connecting adhesive tape bonding in the light guide plate not by institute On the region for stating even optical element covering, there is preset clearance between the flexible PCB and the even optical element；

Light shield layer is set in the non-display area of the backlight module, and for blocking that the light source sends out through described pre- The light for staying gap to leak out,

Wherein, the connection adhesive tape includes multiple first adhesive tapes portion and multiple second adhesive tapes portion, and the setting of first adhesive tape portion exists The corresponding region of the light source, the corresponding area of interval region between the two neighboring light source is arranged in second adhesive tape portion Domain, the connection adhesive tape at least partly exceed the flexible PCB close to one end of the preset clearance, first adhesive tape Size of the portion beyond the flexible PCB is more than the size that second adhesive tape portion exceeds the flexible PCB.

2. backlight module according to claim 1, which is characterized in that the light guide plate includes light inputting end portion and light guide plate master Body portion, the multiple light source is arranged deviates from the side in the light guide plate main body portion in the light inputting end portion, and the even optical element is set It is placed in the light guide plate main body portion.

3. backlight module according to claim 1, which is characterized in that the light shield layer is set to the even optical element and institute Between stating light guide plate, and the overlay area of the light shield layer corresponds to the even optical element or the light guide plate close to the light source One end end regions.

4. backlight module according to claim 1, which is characterized in that the even optical element includes along far from the light guide plate Diffusion barrier that direction is set gradually, the first bright enhancement film, the second bright enhancement film, the light shield layer setting is in the diffusion barrier and described the Between one bright enhancement film or the light shield layer is arranged between first bright enhancement film and the second bright enhancement film.

5. backlight module according to claim 1, which is characterized in that the light shield layer is thick along the direction far from the light source Degree is gradually reduced.

6. backlight module according to claim 1, which is characterized in that the backlight module further comprises being arranged described Shading rubber belt of the flexible PCB far from the light source one side, the shading rubber belt are connect with the even optical element.

7. backlight module according to claim 1, which is characterized in that the thickness of the light shield layer is less than the connection adhesive tape Thickness.

8. backlight module according to claim 1, which is characterized in that portion of the connection adhesive tape in the preset clearance Divide and is tapered into along the direction thickness far from the light source.

9. a kind of display module, which is characterized in that the display module includes display panel and for being carried for the display panel For the backlight module of backlight, the backlight module is the backlight module described in claim 1-8 any one.

10. a kind of electronic device, which is characterized in that the electronic device includes the display module described in claim 9.